diff --git a/src/test/ui/auto-trait-validation.stderr b/src/test/ui/auto-trait-validation.stderr
index d797f30a2fc8..51422fab81fd 100644
--- a/src/test/ui/auto-trait-validation.stderr
+++ b/src/test/ui/auto-trait-validation.stderr
@@ -18,5 +18,5 @@ LL | auto trait MyTrait { fn foo() {} }
 
 error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0380, E0567.
+Some errors have detailed explanations: E0380, E0567, E0568.
 For more information about an error, try `rustc --explain E0380`.
diff --git a/src/test/ui/traits/traits-inductive-overflow-supertrait-oibit.stderr b/src/test/ui/traits/traits-inductive-overflow-supertrait-oibit.stderr
index 40c2c2e4c9d1..63182a6bd958 100644
--- a/src/test/ui/traits/traits-inductive-overflow-supertrait-oibit.stderr
+++ b/src/test/ui/traits/traits-inductive-overflow-supertrait-oibit.stderr
@@ -17,4 +17,5 @@ LL |     let (a, b) = copy(NoClone);
 
 error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0277`.
+Some errors have detailed explanations: E0277, E0568.
+For more information about an error, try `rustc --explain E0277`.
diff --git a/src/test/ui/typeck/typeck-auto-trait-no-supertraits-2.stderr b/src/test/ui/typeck/typeck-auto-trait-no-supertraits-2.stderr
index 1184e30749fe..8755bcded9d2 100644
--- a/src/test/ui/typeck/typeck-auto-trait-no-supertraits-2.stderr
+++ b/src/test/ui/typeck/typeck-auto-trait-no-supertraits-2.stderr
@@ -6,3 +6,4 @@ LL | auto trait Magic : Sized where Option<Self> : Magic {}
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0568`.
diff --git a/src/test/ui/typeck/typeck-auto-trait-no-supertraits.stderr b/src/test/ui/typeck/typeck-auto-trait-no-supertraits.stderr
index 7b45ca07b35c..5a3888349095 100644
--- a/src/test/ui/typeck/typeck-auto-trait-no-supertraits.stderr
+++ b/src/test/ui/typeck/typeck-auto-trait-no-supertraits.stderr
@@ -6,3 +6,4 @@ LL | auto trait Magic: Copy {}
 
 error: aborting due to previous error
 
+For more information about this error, try `rustc --explain E0568`.